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MAX8559

Dual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN

Maxim Integrated 

19-3121; Rev 2; 8/05

EVAALVUAAILTAIOBNLEKIT

Dual, 300mA, Low-Noise Linear Regulator

with Independent Shutdown in UCSP or TDFN

General Description

The MAX8559 dual, low-noise, low-dropout (LDO) linear

regulator operates from a 2.5V to 6.5V input voltage

and delivers at least 300mA of continuous output cur-

rent. It offers low output noise and low dropout of only

60mV at 100mA. Typical output noise for this device is

32µVRMS, and PSRR is 70dB at 10kHz. Designed with

an internal P-channel MOSFET pass transistor, the

MAX8559 maintains a low 115µA supply current per

LDO, independent of the load current and dropout volt-

age. Other features include short-circuit protection and

thermal-shutdown protection. The MAX8559 includes

two independent logic-controlled shutdown inputs and

is capable of operating without a bypass capacitor to

further reduce total solution size. The MAX8559 is avail-

able in a miniature 8-bump UCSP™ (2mm x 1mm) or

8-pin TDFN (3mm x 3mm) package.

Applications

Cellular and Cordless Phones

PDAs and Palmtop Computers

Notebook Computers

Digital Cameras

PCMCIA Cards

Wireless LAN Cards

Handheld Instruments

Features

♦ Two Low-Dropout-Voltage Regulators

♦ Low 32µVRMS Output Noise

♦ 300mA Output Current for Each LDO

♦ 70dB PSRR at 10kHz

♦ Independent Shutdown Controls

♦ Low 60mV Dropout at 100mA Load

♦ 115µA Operating Supply Current per LDO

♦ 1.5V to 3.3V Factory-Preset Output

♦ Small Ceramic Output Capacitors

♦ Output Current Limit

♦ Thermal-Overload and Short-Circuit Protection

♦ 1.95W Power-Dissipation Capability (TDFN)

♦ 2mm2 Footprint (UCSP)

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX8559EBAxy*-T -40°C to +85°C 8 UCSP (B8-1)

MAX8559EBAxy*+T -40°C to +85°C 8 UCSP (B8-1)

MAX8559ETAxy*-T -40°C to +85°C 8 TDFN-EP**

MAX8559ETAxy*+T -40°C to +85°C 8 TDFN-EP**

*xy = Output voltage code (see the Output Voltage

Selector Guide).

**EP = Exposed pad.

+Denotes lead-free package.

Typical Operating Circuit

Pin Configurations

TOP VIEW

INPUT

2.5V TO 6.5V

2.2μF

min

ON

OFF

ON

OFF

INA

OUTA

INB

SHDNA MAX8559 OUTB

SHDNB

BP

GND

1.5V TO 3.3V

2.2μF/150mA

4.7μF/300mA

1.5V TO 3.3V

2.2μF/150mA

4.7μF/300mA

0.01μF

(OPTIONAL)

UCSP is a trademark of Maxim Integrated Products, Inc.

Output Voltage Selector Guide appears at end of data sheet.

8 7 65

MAX8559ETA

2 34

TDFN

3mm x 3mm

A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.

Pin Configurations continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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